Key result
Beta-thalassemia intermedia is linked to higher cardiac output and altered LV diastolic function vs major.
Why the study?
The forms and severity of cardiac complications in asymptomatic beta-thalassemia intermedia and beta-thalassemia major patients were not well characterized.
Cross-Sectional
Beta-thalassemia intermedia is associated with a progressive high-output state and altered diastolic function, suggesting a need to reevaluate its current management strategies.
Intermedia associated with higher output and diastolic changes; hypothesis-generating for subtype-specific cardiac monitoring pending prospective data.
The forms and severity of cardiac complications were investigated in patients with asymptomatic thalassemia intermedia and thalassemia major by M-mode, bi-dimensional echocardiography (ECHO) and echo-Doppler. Twenty-eight patients of both sexes with beta-thalassemia intermedia (beta-TI), mean age 23.2 +/- 6.3 years, untransfused or minimally transfused, were compared to 42 age- and sex-matched subjects with thalassemia major, who were regularly treated with hemotransfusive therapy [pre-transfusion hemoglobin (Hb) values 9.5 +/- 0.9 g/dL] and iron chelation. All patients were splenectomized. Age and sex matched healthy control subjects were randomly selected. beta-Thalassemia major (beta-TM) patients showed a marked reduction in contractile state and a milder left ventricular (LV) enlargement than beta-TI patients. Cardiac output (CO) and cardiac index (CI) were increased in both groups of patients but appeared significantly higher in beta-TI patients with consequent altered LV diastolic function indices. In addition, beta-TI patients had reduced indices of pulmonary artery flow related to long-term chronic anemia rather than iron overload. The progressive rise in CO and CI casts doubts on the current management of beta-TI syndromes.
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Ferrara et al. (2004) conducted a cross-sectional in beta-Thalassemia Major and beta-Thalassemia Intermedia. beta-Thalassemia Intermedia vs. beta-Thalassemia Major and healthy controls was evaluated on Cardiac complications assessed by echocardiography (contractile state, LV enlargement, cardiac output, cardiac index, and diastolic function). Beta-thalassemia intermedia was associated with significantly higher cardiac output and cardiac index, and altered left ventricular diastolic function, compared to beta-thalassemia major.
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